What is keyed screw jack?

The keyed screw jack usually means acme screw jack with anti-rotation function.
Some loads are not allowed to rotate with the screw. These applications require a keyed screw jack. A key, fixed to the jack housing and inserted in a keyway milled into the lifting screw, forces the lifting screw to translate without rotating.
acme screw jack with keyway

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Philippine customer screw jack installation site

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